Scala A, Valeriani C, Sciortino F, Tartaglia P. Fluctuation-dissipation relations and energy landscape in an out-of-equilibrium strong-glass-forming liquid.
PHYSICAL REVIEW LETTERS 2003;
90:115503. [PMID:
12688940 DOI:
10.1103/physrevlett.90.115503]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2002] [Indexed: 05/24/2023]
Abstract
We study the out-of-equilibrium dynamics following a temperature jump in a model for silica, a strong liquid, and compare it with the well known case of fragile liquids. We calculate the fluctuation-dissipation relation, from which it is possible to estimate an effective temperature T(eff) associated with the slow out-of-equilibrium structural degrees of freedom. We find the striking and unexplained result that, different from the fragile liquid cases, T(eff) is smaller than the bath temperature.
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